"Changes of Food in the Mouth" Our Body PPT Download

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"Changes of Food in the Mouth" Our Body PPT Download

Part 1: Observing the oral cavity

What would happen if we put food in our mouth and chew it (jǔ júe) for a while?

1. Take a piece of steamed bun and chew it in your mouth.

2. Stop chewing 5 times and observe the changes in the food.

3. Stop chewing 30 times and observe the changes in the food.

The role of saliva

Normal people secrete 1000-1500 ml of saliva every day. Saliva has many functions: it can prevent dryness of the mouth and lubricate food; it can clean the mouth and wash away food debris remaining in the mouth; it can keep the mouth moist and make it easier to speak. In addition, when harmful substances enter the oral cavity, saliva can dilute and neutralize them and wash them away from the oral mucosa; amylase in saliva can decompose starch in food into maltose; lysozyme in saliva Has a bactericidal effect…

PPT on the changes of food in the mouth, part 2: observing teeth

Incisor teeth: 8

Canine teeth: 4

Molars: 20

Function

Incisors: cut food

Canine teeth: tear food apart

Molars: grind food

During the digestion process, the teeth cut, tear, and grind the food, which is stirred by the tongue and mixed with saliva to become food and enter the esophagus.

PPT on the changes of food in the mouth, part 3: formation of dental caries

Do you know how cavities form?

After eating, there will be residue left on the surface of the teeth and in the gaps between the teeth. If not removed in time, the bacteria in the mouth will ferment the residue and form an acid. The teeth are gradually destroyed by the effect of this acid. Next, a perfectly good tooth was gradually destroyed until only the root was left.

The correct way to brush your teeth

Do you know how to brush your teeth correctly?

Hold the toothbrush at a 45-degree angle to the teeth. When brushing the upper teeth, rotate the toothbrush from top to bottom. When brushing the lower teeth, rotate the toothbrush from bottom to upward, brushing both the inside and outside. When brushing the occlusal surface, brush horizontally back and forth. Repeat 8 to 10 times for each area to brush clean.

Tooth growth knowledge

Classmates, our fourth grade students are in the period of teeth replacement, and we only change teeth once in a lifetime. Therefore, the teacher hopes that students will pay attention to protecting their teeth so that they can enjoy food happily and grow up healthily throughout their lives!

PPT on the changes of food in the mouth, Part 4: Classroom exercises

1. Fill in the blanks

(1) The place where food digestion begins is ( ).

(2) The ( ) in saliva can decompose the starch in food into ( ); the ( ) in saliva has a bactericidal effect.

(3) There are ( ) teeth, ( ) incisors, ( ) canines, and ( ) molars in the oral cavity.

(4) From a structural point of view, the tooth has two parts ( ) and ( ).

Keywords: Free download of Chinese PPT courseware for the first volume of the fourth grade of the textbook version, PPT download of the changes of food in the mouth, PPT download of our body, .PPT format;

For more information about the PPT courseware "Our Body Changes in Food in the Mouth", please click on the "Our Body ppt Changes in Food in the Mouth" ppt label.

"Changes of Food in the Mouth" Our Body PPT:

"Changes of Food in the Mouth" Our Body PPT Part One Content: Observing the Mouth Observe the changes of several different foods from entering the mouth to before swallowing. What happens to food in the mouth during different chewing times? Teeth in the mouth...

"The Journey of Food in the Body" Our Body PPT Download:

"The Journey of Food in the Body" Our Body PPT Download Part One: Introduction of New Lessons Most students like to travel, right? Today the teacher wants to go on a trip with everyone, okay? Our trip is neither to visit the magnificent mountains and rivers, nor to explore...

"The Journey of Food in the Body" Our Body PPT:

"The Journey of Food in the Body" Our Body PPT Part One Content: Where does the food we eat go? We eat various foods every day. Where does this food go from the mouth? Which organs in our body are related to food Is it related to digestion and absorption? exist..

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Update Time: 2024-07-11

This template belongs to science courseware Fourth Grade Science Volume 1, Textbook Edition industry PPT template

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